[Shipping Labels Revamp] Fix Shipping Label package serialization

[ThomazFB]

Summary

Finish issue #12284 by adding JSON parsing and mapping resilient to the different responses the Package API might return.

Screen Capture

Screen_recording_20241204_183356.mp4

How to Test

1. Go to the Shipping Labels new feature through an eligible Order
2. Hit the Select Package button
3. Verify that both Saved and Carrier Package options are loading data

Update release notes:

• I have considered if this change warrants user-facing release notes and have added them to RELEASE-NOTES.txt if necessary.

Reviewer (or Author, in the case of optional code reviews):

Please make sure these conditions are met before approving the PR, or request changes if the PR needs improvement:

• The PR is small and has a clear, single focus, or a valid explanation is provided in the description. If needed, please request to split it into smaller PRs.
• Ensure Adequate Unit Test Coverage: The changes are reasonably covered by unit tests or an explanation is provided in the PR description.
• Manual Testing: The author listed all the tests they ran, including smoke tests when needed (e.g., for refactorings). The reviewer confirmed that the PR works as expected on big (tablet) and small (phone) in case of UI changes, and no regressions are added.

[wpmobilebot]

📲 You can test the changes from this Pull Request in WooCommerce-Wear Android by scanning the QR code below to install the corresponding build.

	App Name	WooCommerce-Wear Android
	Platform	⌚️ Wear OS
	Flavor	Jalapeno
	Build Type	Debug
	Commit	a974349
	Direct Download	woocommerce-wear-prototype-build-pr13059-a974349.apk

[wpmobilebot]

📲 You can test the changes from this Pull Request in WooCommerce Android by scanning the QR code below to install the corresponding build.

	App Name	WooCommerce Android
	Platform	📱 Mobile
	Flavor	Jalapeno
	Build Type	Debug
	Commit	a974349
	Direct Download	woocommerce-prototype-build-pr13059-a974349.apk

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 27 lines in your changes missing coverage. Please review.

Project coverage is 40.47%. Comparing base (f8b3e4b) to head (a974349).
Report is 7 commits behind head on trunk.

Files with missing lines	Patch %	Lines
...nglabels/packages/networking/CarrierPackageDTOs.kt	0.00%	17 Missing ⚠️
...glabels/packages/networking/PackageResponseDTOs.kt	0.00%	4 Missing ⚠️
...pinglabels/packages/networking/StorePackageDTOs.kt	0.00%	4 Missing ⚠️
...ckages/datasource/WooShippingLabelPackageMapper.kt	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##              trunk   #13059   +/-   ##
=========================================
  Coverage     40.47%   40.47%           
  Complexity     6187     6187           
=========================================
  Files          1287     1287           
  Lines         74166    74164    -2     
  Branches      10147    10147           
=========================================
  Hits          30015    30015           
+ Misses        41546    41544    -2     
  Partials       2605     2605           

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